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Effect of temporal predictability on the neural processing of self-triggered auditory stimulation during vocalization
Zhaocong Chen1, Xi Chen, Peng Liu
1Department of Rehabilitation Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, People's Republic of China.
BMC Neuroscience
|June 1, 2012
Summary
Neural responses to self-triggered stimuli depend on timing predictability. Predictable self-stimulation leads to suppressed P2 responses, while unpredictable stimulation enhances them, suggesting timing accuracy drives sensory suppression.
Area of Science:
- Neuroscience
- Auditory Perception
- Action Monitoring
Background:
- Sensory perception differs for self-generated versus external stimuli.
- Event-related potential (ERP) studies investigate neural responses to self- vs. externally-triggered stimuli.
- Temporal predictability of sensory consequences influences action perception.
Purpose of the Study:
- To examine neural responses to self-triggered auditory stimuli compared to externally-triggered stimuli.
- To investigate the role of temporal predictability (delay) between motor act and stimulus onset.
- To understand the mechanisms underlying sensory suppression of self-produced actions.
Main Methods:
- Subjects phonated vowels and clicked a mouse, receiving pitch-shift stimuli (PSS) in auditory feedback.
- Stimuli were either self-triggered (0 ms or 500-1000 ms delay) or externally-triggered (500-1000 ms delay).
- Motor effects from mouse clicks were corrected; ERPs (specifically P2 responses) were analyzed.
Main Results:
- Predictable self-triggered PSS (0 ms delay) showed suppressed P2 responses compared to unpredictable external stimuli.
- Unpredictable self-triggered PSS (500-1000 ms delay) showed enhanced P2 responses.
- Neural responses varied significantly based on the temporal relationship between action and sensory feedback.
Conclusions:
- Temporal predictability of stimulus delivery significantly modulates neural responses to self-triggered events.
- Sensory suppression of self-produced actions appears primarily driven by accurate prediction of stimulus timing.
- Findings differentiate between timing-dependent prediction and non-specific motor suppression mechanisms.
